Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64181b5bf3c503b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 11:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de08779f8a0ceb918fe92240d40dbd67 SHA-1: c88888e52397715e300e2c8e52d8878417fbfd97 SHA-256: e64181b5bf3c503b1e39960eda42a88e50f67de6124fe58f102eea1065489d0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external domains, many of which appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of multiple unknown URLs indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://firewheels.pe/userfiles/file/82933865106.pdf In PDF document text
    • http://boschvietnam.com/files/usersfiles/files/fokovabebobitakitiz.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/gotigavoforu.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/44661706865.pdfIn PDF document text
    • http://glassick.com/userfiles/file/52215443728.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/9184309652.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/kenurukinotu.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/kexodukixuvepaxogube.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/liririsezoza.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/rezukasegupuzonovule.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/mivaz.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/modirifebep.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b496aa1e53---vumakukevominuberolilobat.pdfIn PDF document text
    • http://xn--c1ajalgzu0a.xn--p1ai/userfiles/file/62176642239.pdfIn PDF document text
    • http://salwex.hu/file/51998415940.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/tezexetala.pdfIn PDF document text
    • http://inspeq.eu/public/files/josebinafuxidufan.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/577182426.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143967a75558---54260027537.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/nugof.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/xuwezagakanafinopulu.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/63676737463.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/72215127629.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36836202148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bloons+td+5+app+storePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA3 14876 bytes
SHA-256: c1f4d14387f717d01a9cd543cf759c03c6c266f15d65f3738129488f5558d3c4
font_01_sfnt_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10480 bytes
SHA-256: 85201889c5102403fe8c9ade8807b7b0d40e34fa7480353ac6172f360af314fe
font_02_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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